Radiotube



Aug. 31, 1926.

H. K. HUPPERT RADIOTUBE INVENTOR.

H LIF P ER T HENRY k BY ATTORNEY Patented Aug. 31, 1926.

, v I 1,597,393" UNITED STATES PATENT OFFICE.

HENRY K. HUIPPERT, OF SAN FRANCISCO, CALIFORNIA.

RADIOTUBE.

Application filed June 11, 1924. Serial No. 719,440.

This invention relates to improvements in radio tubes.

The principal object of this invention is to provide means for greatercontrol of the electronic flow. 7

Another object is to provide a tube wherein alternating current may beemployed for .the lighting of the filaments.

A still further object is to provide a tube having a greater platesurface.

Another object is to provide a double filath like numerals are employedto designate like parts throughout the same z- Figure 1 1s a verticalcross section of a tube constructed in accordance-with my invention,

Figure 2 is a cross section of the tube taken on the line 22 of Figure1,

Figure 3 is a bottom plan view of the tube,

Figure 4 is a diagrammatic arrangement showing the employment of atransformer employing alternating current for lighting the filaments,

Figure 5 discloses a diagrammatic arrangement of the standard form offilament, disclosing the electronic losses, and

Figure 6 is. a detail perspective View showing one-half of my improvedplate construction.

Radio tubes employ a heated filament for the purpose of causing anelectron flow and up to the present time, as far as applicant 1S awareof, it has been impossible to satisfactorily employ alternating currentfor heating filaments without the use of external apparatus, due to thefact that a decided hum would be produced by an alternating current andamplified in the customary manner by the action of the tube. Applicanthas devised a tube which permits the use of an alternating currentwithout the objectionable features referred to and also receives greaterelectron control and by re ferring to the drawings it will be noted thatthe numeral 5 designates the customar glass bulb and the numeral 6 themetal base adapted to support the bulb. The base is held to the bulb bya plastic composition as shown at- .7, while a porcelain insulator 8 isheld within the base b This base supports four prongs designated at 11,which prongs-are customary in all which the elements of the tube areconnected.

A support 12 is sealed to the base of the tube 5 which has mountedtherein the tube elements. It is, of course, understood that e tube isevacuated in the usual manner.

y an annular ring 9;

These prongs form the leads to Referring to Figure 6, it will be notedthat I sists of two semi-circular plates 14 and b referring to Figure 2,it will be noted that two of these plates are employed the same The wire16 has a lead 18 connected thereto, which lead extends downwardly and isconnected to one of the prongs 11.

ounted within the barrels are grids 19 23, respectively. The lower endof the rod 22 being bent downwardly and sealed in the support 12. Therod 23 is also sealed in the support 12 and is connected by a lead 24.-to one of the prongs 11.

At 26, I have shown a U-shaped wire con- 21. Filaments 27 and 28 arearranged so as to extend throughout the length of the grids 19 and 21,respectively, which filaments have their upper extremities supported bya Y 29, which Y is, in turn, mounted upon a rod 31 extending downwardlyinto the support 12. This rod is connected by a lead 32 to the he lowerextremity of the filaments 27 and 28 are connected to wires 33 and 34.,respectively, which wires are sealed to the support 12 and are connectedby th leads 36 and 37 to the remaining prongs 11.

The structure thus described completes the structure of my improvedtube. By referring to Figure 4, I have diagrammatiy cally representedthe filaments of the tube at have provided a plate 13 which con ary F ofa transformer and to the neutral point G I connect a lead H. At I,I'have shown an electrical connection between C and H, which connectsthe zero potential point of the transformer to, the zero potential ofthe filament.

The purpose of the conductor I is two fold. In the first. place shouldone of the filaments, either A or"B burn out, the conductor I will formthe return lead. Also the conductor may be considered as being used inplace of a potentiometer and acts as the same in conjunction with thereceived si nal, thereby eliminatin the 'A-C Be present.

hum, which would, otherwise, Experiments have proventh'at when theconductor I is severed a hum immediately commences in the circuit. I

At J I have shown the ,primary of a transformer which receives itsenergy from any suitable alternating source of electrical current. Itispossibleto secure greater electron control, thanis possible with theusual forms of tube having the hair-pin filament, because in my tube thefilaments are entirely surrounded by a grid and a plate, a conditionwhich does not exist in the usual form of tube and by referring toFigure 5 it will be noted that there is no plate or grid to entirelysurround the filaments, therefore space between the dotted linesrepresents a loss and by referring to Figure 5 it will be seen that thisspace comprises a considerable area, substantially the area. between thepoints CD and A- B, therefore,

it will easilybe seen that it is impossible to control electronic actionbetween the dotted lines of Figure 5, while with the double barrelconstruction the plates en tirely surround the grid and the filaments,with the resulting increased efiiciency.

It is possible with my tube to short the two prongs 11 to which thefilament leads are connected and use the shell for the return of-vthecurrent, with the result that the tube will function on one-half thevoltage that is required when the filaments are forth.

that '1 have devised a.

in series, an increased electron emission will It is to be understoodthat theform of my invention herewith shown and described is to be takenas a preferred example of the same, and that various changes in theshape, s1ze and arrangement ofparts may be resorted to without departingfrom the spirit of .the invention or the scope of the subjoined claim.

Having thus described my invention, I claim A radio tube comprising abase, a bulb mounted on said base, a support mounted in said bulb, aplurality of'prongs secured to said base, leads extending from saidprongs and said base and terminating in said sup- 'port, a plate mountedon said support, said plate being shaped so, as to form two parallelbarrel-shaped structures, means for electrically connecting said plateto one of said leads in said support, a grid centrally positioned ineach of said barrels and mounted above said support, means for conture.

. HENRY K. HUPPERT.

